organized way, he said Friday at a joint news conference in Washington with German Foreign Minister Guido Westerwelle. In Geneva, we will test who is serious. Are the Russians serious pushing to that ? I believe they are. -LRB- But -RRB- it is not helpful to have a lot of other ammunition, other supplies overtly going in. Syrian arms embargo: Why more weapons to Syria is a mistake Conference on crisis planned for Switzerland He was referring to an international conference on the crisis slated for Switzerland. The plans are being worked out, but al-Assad predicted it will take place in June. We have announced a couple of days ago that we agree in principle to attend, he said. But the Syrian leader made clear that his position may change, and Damascusdelegation may withdraw, if certain conditions are imposed. So the idea of the conference, of a meeting, in principle is a good one, he told Al-Manar TV. We will have to wait and see. The National Coalition, the main rebel umbrella group, has demanded al-Assad step aside in order for it to take part in the talks, which were originally scheduled for this month. It is difficult to continue when Syrians are constantly being hammered by the Assad regime with the help of outside forces, George Sabra, acting chairman of the National Coalition, said in a statement. He cited the siege of Qusayr and attacks on Eastern Gouta, a suburb